Devices for precipitating and drawing off annoying and harmful vapors and gases



Dec. 12, 1950 G. DEIBEL 2,533,562

DEVICES FOR PRECIPITATING AND DRAWING OFF ANNOYING AND HARMFUL VAPORSAND GASES Filed Sept. 17, 1949 Q 7 Fl 2 f 11 ,8 14 I I g I T 47 Invenfor:

\ jrfif kz Quad Patented Dec. 12, 1950 ING OFF ANNOYING VAPORS AND GASESv Gottfried Deibel, Dresden, Germany Application September 17, 1949.Serial No. 116,232 In Germany April 26, 1949 2 Claims. (01. 98-115) Thisinvention relates to a device for precipiv tating and drawing offannoying and harmful vapors and gases.

To remove injurious vapors as produced for instance in chemical plants,and particularly in the laboratories thereof, hoods and similar devicesof known type are used. They are found also in dental laboratories andother small-scale workrooms and are made as a rule of acid-proof ceramicmaterials. Such hoods are usually provided with an outlet pipe, adischarge bottom and a receiver for the condensates'precipitated andrunning down on the inner walls of the hood, as shown for example inGerman Patent No. 650,402. Ceramic devices of this class have been foundto be generally satisfactory in use, though they still suffer fromcertain drawbacks which the present invention seeks to overcome.

A known device of the type described comprises a separately formed toppart containing an out let pipe and a separately formed lower partincluding a receiver, the two parts being then assembled and placed in afiring furnace. This method involves unavoidable variations owing todifferences in the composition of the ceramic masses and in theirmoisture content after molding with the result that stresses developwhen the parts are united by firing and cause a considerable amount ofwaste.

Cracks, fissures and breakage produced by firing and responsible for thehigh percentage of waste have of course the effect of raising the costof the devices free from such defects. Furthermore, the bottoms of theknown devices have surfaces sloping towards the center and thereforecannot hold a plurality of burners and reagent basins placed thereon,though this is desirable or necessary in many instances. To overcomethis drawback in practical operation an extra plate has to be put on thebottom to act as support for burners and basins. Another defect is thebulky size of the known devices representing a single ceramic unit whichmay be easily broken in transit.

According to the invention the drawbacks mentioned are overcome byconstructing the device of two separately formed and fired ceramicparts, viz. a main top part limited below by a bottom serving also assupport and a base fitted with discharging faces leading to aninsertable receiver. Owing to this two-part construction, the amount ofwaste during firing is reduced to a tolerable minimum, and the two partscan be more easily transported and are less exposed to fracture ordamage than a single ceramic body.

AND HARMFUL The device as contemplated by the invention permits also,according to its size, the easy insertion of a plurality of burners andbasins.

The top part to be connected to an outlet pipe has an edge portionoverlapping the base, the union of the parts being effected byacid-proof cementing. The parts can be readily combined at the placewhere the device is to be installed without requiring expert assistance.In the manufacture of a device according to the invention any suitablematerial, such as white ware, porcelain, glass, etc. may be employed.

The invention is illustrated by way of example in the accompanyingdrawing, in which Figure 1 is a vertical cross section, partly inelevation, on the line II of Fig. 2; and

Fig. 2, a section on the line II-II of Fig. 1.

The hood-shaped device comprises the two separately formed and firedparts II), II. The top part I0 connects in known manner with the outletpipe l2 leading to a chimney or exhauster, not shown, and is limitedbelow by the bottom l3 simultaneously made with the rest of the top partand provided with a horizontal upper plane surface I4 which acts assupport for a plurality of reagent basins I5 with their burners l6 and atripod 16.

The bottom i3 slopes towards the center and possesses channels orgrooves I! for guiding condensates and, especially, liquid overflowingfrom the basins 5 to a central opening l8 whence they pass into thereceiver l9. As seen the bottom l3 has a generally pyramidal lowersurface and the channels l1 through the upper surface extend at theirbottoms along such pyramidal lower surface.

A slide 20 preferably formed of a pane of glass serves for closing anopening for introducing and removing basins.

The separately formed and fired base H is made of acid-proof ceramicmaterial. The part 10 to be placed on the base I l is fitted on itslower rim with an edge member 2| overlapping the correspondinglydimensioned base II and united therewith by acid-proof cementing. Thereceiver 19 for collecting condensates and liquid overflowing from thebasins I5 is inserted in the base II and rests therein on the bottom 22provided with lateral guides 23. The guides 23 are connected with thewall of the base H by inclined walls 24 which continue to extendhorizontally towards the base wall and thus form a good support for thebottom of the top portion Ill. The bottom 25 completes the constructionof the base ll.

I claim:

1. A device for precipitating and drawing off annoying and harmfulvapors and gases developedduring boiling of acids and the like, saiddevice comprising a casing of acid-proof ceramic material having adischarge plate at the bottom thereof and having a hood portion at thetop thereof, said hood having an outlet pipe affixed thereto, and saidplate having a central opening therethrough, and having a horizontal topplane surface and a generally pyramidal lower surface having inclinedchannels through the upper surface of said plate, the bottoms of saidchannels extending along said pyramidal lower surface, said channelsleading from adjacent the periphery of said plate to said opening, abase supporting said casing, and having ,an opening in the side wallthereof, a removable receiver in said base insertable through saidopening and a channel shaped support in said base to carry and positionthe receiver beneath said central opening in said discharge plate.

2. The combination set forth in claim 1 in which said casing has adepending flange at the lower edge thereof overlapping the outer wall ofsaid base and secured thereto.

GOTTFRIED DEIBEL.

- REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,085,297 Deibel June 29, 1937

